Two cars start from the same point on flat ground. The first car drives off directly north at 25 m/s. Two seconds later the second car drives off directly east at 20 m/s. After how many seconds are they 1km apart?

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!